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Cordyline

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English

Indoor Plants

Cordyline stricta

Photo: Jardin botanique de Montréal (Josée Bouthot)

Cordyline stricta

Photo: Jardin botanique de Montréal (Josée Bouthot)

Onglets

Botany

Origin and description

Cordyline terminalis is a species native to moist tropical forests in Southeast Asia, Australia and Hawaii. It can grow several metres tall in its natural habitat. As a houseplant, it is a small single-trunked shrub that rarely grows to more than 1 metre. It is a slow grower and does not flower indoors. The cultivars have highly colourful lance-shaped leaves often splashed with red or pink.

Toxicity

As a precaution, keep this plant out of the reach of children and pets.

Common name

Cordyline / Good luck plant

Latin name (genus)

Cordyline terminalis

French common name

Cordyline / Dragonnier / Plante Ti

Botanical family

Agavaceae

Horticulture

Growing conditions

To keep the leaves colourful, this plant needs bright indirect sunlight. It is best to place it near a west- or south-facing window, but protected from direct sunlight. It requires warm temperatures and high humidity. This plant prefers temperatures between 18 and 24ºC, but never below 15ºC. It tolerates warmer temperatures provided it has high humidity. Protect it from cold drafts.

Easy to grow?

This plant is fairly difficult to grow because it requires fairly high humidity and bright light in order to keep it colourful.

Watering and fertilizer

Water sufficiently to moisten the soil mixture, without soaking it. Avoid extremes (overly wet or dry soil mixture). Allow the soil surface to dry out between waterings. Cut back on watering when temperatures are cooler, especially in winter. Fertilize three or four times during the growing period with indoor plant food or all-purpose fertilizer like 20-20-20.

Pruning and maintenance

Repotting

Repot every two or three years in a well-drained peat-based potting mix. For larger plants that are harder to handle, you can simply add potting soil, being careful not to damage the roots near the surface.

Propagation

The scale insect superfamily (Coccoidea) includes several genera of sucking insects capable of damaging indoor plants. Most of them are tropical, non-hardy species, but they adapt very well to our homes.

Over 5,000 species of thrips have been identified around the globe, hundreds of them in North America. Western flower thrips (Frankliniella occidentalis) and onion thrips (Thrips tabaci) are the greenhouse species that cause the most damage in Quebec.

Two-spotted spider mites are not true insects, but tiny arthropods, just like other mites and ticks. With their four pairs of legs, they look like miniature spiders. They are so small that they are difficult to see, but they do weave tell-tale whitish webbing.

Physiological disorders

Symptoms

Possible causes

Solutions

Gradual decline Old leaves dry off Dry leaf tips

Air too dry

Increase humidity

Leaf edges and tips turn brown

Over-accumulation of mineral salts in soil Too much chlorine in water Over-watering

Water soil several times in a row to leach out mineral salts Let water rest for 24 hours before using Allow soil surface to dry out between waterings

Leaves rot and drop off

Air too cold and damp

Move plant to a warmer room and allow soil surface to dry out between waterings, especially in winter